The key bit is the top-level extension element x:wsbuffer which provides a stock of blank character content to be used in the replacement operation.

关键是顶层的扩展元素 x:wsbuffer，它提供了替换操作中所使用的空白字符内容。

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IMPORTANT: Removal and replacement of the heating element involves the disconnection of water piping connections and electrical connections.

重要：加热元件的拆卸和更换涉及到水管的拆卸和电路连接的断开。

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CONCLUSION: the finite element model of artificial disc replacement can be established by CT scanning, digital processor and computer aided design, and used for further study on spinal biomechanics.

结论：通过CT断层扫描、图像数字化处理及计算机辅助设计等方法，可以建立腰椎人工椎间盘置换的有限元模型，用于脊柱生物力学的进一步研究。

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Designing a replacement that would be universal, but lack an element of compulsion would be extremely hard.

BBC: President Obama faces tough choices on healthcare